blocks|key|2032995|text|您可以使用HttpContext|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2032996|filterContext.HttpContext.Items["criteria"]+=+criteria;|code-block|syntax|javascript|2032997|你可以在行动中读到它：|2032998|[YourActionFilter]
public+ActionResult+SomeAction()+
{
++++var+criteria+=+HttpContext.Items["criteria"]+as+DetachedCriteria;
}|2032999|entityMap^0|5|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

You could use the <code>HttpContext</code>:

<pre><code>filterContext.HttpContext.Items["criteria"] = criteria;
</code></pre>

And you can read it in the action:

<pre><code>[YourActionFilter]
public ActionResult SomeAction() 
{
 var criteria = HttpContext.Items["criteria"] as DetachedCriteria;
}
</code></pre>

blocks|key|2033010|text|如果将项目作为参数传递到操作中，则在ViewData或视图模型中设置项目。在这里，我设置了ViewModel的属性|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2033011|public+override+void+OnActionExecuting(ActionExecutingContext+filterContext)
+{
+++++ViewModelBase+viewModel+=+null;
+++++foreach+(object+parameter+in+filterContext.ActionParameters.Values)
+++++{
+++++++++if+(parameter+is+ViewModelBase)
+++++++++{
+++++++++++++viewModel+=+(ViewModelBase)parameter;
+++++++++++++break;
+++++++++}
+++++}
+++++if(viewModel+!=null)
+++++{
+++++++++viewModel.SomeProperty+=+"SomeValue";
+++++}
+}


++++public+ActionResult+About(ViewModelBase+model)
++++{
++++++string+someProperty=+model.SomeProperty;
}|code-block|syntax|javascript|2033012|下面是我认为您更喜欢的非类型化版本：|2033013|+++public+override+void+OnActionExecuting(ActionExecutingContext+filterContext)
++++{
++++++++filterContext.Controller.ViewData.Add("TestValue",+"test");

++++}

+++++++[FilterWhichSetsValue]
++++++++public+ActionResult+About()
++++++++{
++++++++++++string+test+=+(string)ViewData["TestValue"];
++++++++++++return+View();
++++++++}|2033014|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Set item in ViewData or of a viewmodel if you pass it as a parameter into your action.
Here I set the property of a ViewModel

<pre><code>public override void OnActionExecuting(ActionExecutingContext filterContext)
 {
 ViewModelBase viewModel = null;
 foreach (object parameter in filterContext.ActionParameters.Values)
 {
 if (parameter is ViewModelBase)
 {
 viewModel = (ViewModelBase)parameter;
 break;
 }
 }
 if(viewModel !=null)
 {
 viewModel.SomeProperty = "SomeValue";
 }
 }


 public ActionResult About(ViewModelBase model)
 {
 string someProperty= model.SomeProperty;
}
</code></pre>

Here is the untyped version I think you prefer:

<pre><code> public override void OnActionExecuting(ActionExecutingContext filterContext)
 {
 filterContext.Controller.ViewData.Add("TestValue", "test");

 }

 [FilterWhichSetsValue]
 public ActionResult About()
 {
 string test = (string)ViewData["TestValue"];
 return View();
 }
</code></pre>

blocks|key|1819375|text|我建议将其放入路由数据中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1819376|++++protected+override+void+OnActionExecuting(ActionExecutingContext+filterContext)
++++{
++++++++filterContext.RouteData.Values.Add("test",+"TESTING");
++++++++base.OnActionExecuting(filterContext);
++++}

++++public+ActionResult+Index()
++++{
++++++++ViewData["Message"]+=+RouteData.Values["test"];

++++++++return+View();
++++}|code-block|syntax|javascript|1819377|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I would recommend putting it in the Route data.

<pre><code> protected override void OnActionExecuting(ActionExecutingContext filterContext)
 {
 filterContext.RouteData.Values.Add("test", "TESTING");
 base.OnActionExecuting(filterContext);
 }

 public ActionResult Index()
 {
 ViewData["Message"] = RouteData.Values["test"];

 return View();
 }
</code></pre>

blocks|key|1819397|text|Phil+Haack描述了better+approach。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1819398|基本上，这就是你要做的：|1819399|public+class+AddActionParameterAttribute+:+ActionFilterAttribute
{
++++public+override+void+OnActionExecuting(ActionExecutingContext+filterContext)
++++{
++++++++base.OnActionExecuting(filterContext);

++++++++//+Create+integer+parameter.
++++++++filterContext.ActionParameters["number"]+=+123;

++++++++//+Create+object+parameter.
++++++++filterContext.ActionParameters["person"]+=+new+Person("John",+"Smith");
++++}
}|code-block|syntax|javascript|1819400|唯一的问题是，如果你正在创建对象参数，那么你的类(在本例中是Person)必须有一个默认的构造函数，否则你会得到一个异常。|1819401|下面是如何使用上面的过滤器：|1819402|[AddActionParameter]
public+ActionResult+Index(int+number,+Person+person)
{
++++//+Now+you+can+use+number+and+person+variables.
++++return+View();
}|1819403|entityMap|0|LINK|mutability|MUTABLE|url|http://haacked.com/archive/2010/02/21/manipulating-action-method-parameters.aspx^0|D|F|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|C|$]]|$1|O|3|P|5|H|7|16|8|@]|9|@]|C|$I|J]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

The <a href="http://haacked.com/archive/2010/02/21/manipulating-action-method-parameters.aspx">better approach</a> is described by Phil Haack.

Basically this is what you do:

<pre><code>public class AddActionParameterAttribute : ActionFilterAttribute
{
 public override void OnActionExecuting(ActionExecutingContext filterContext)
 {
 base.OnActionExecuting(filterContext);

 // Create integer parameter.
 filterContext.ActionParameters["number"] = 123;

 // Create object parameter.
 filterContext.ActionParameters["person"] = new Person("John", "Smith");
 }
}
</code></pre>

The only gotcha is that if you are creating object parameters, then your class (in this case Person) must have a default constructor, otherwise you will get an exception.

Here's how you'd use the above filter:

<pre><code>[AddActionParameter]
public ActionResult Index(int number, Person person)
{
 // Now you can use number and person variables.
 return View();
}
</code></pre>

If I create an object in a Custom Action Filter in ASP.NET MVC in

<pre><code>public override void OnActionExecuting(ActionExecutingContext filterContext)
{
 DetachedCriteria criteria = DetachedCriteria.For&lt;Person&gt;();
 criteria.Add("stuff");

 // Now I need to access 'criteria' from the Action.....

}
</code></pre>

is there any way I can access the object from the Action that is currently executing.

ASP.NET MVC Pass object from Custom Action Filter to Action

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如果我在ASP.NET MVC中的自定义操作筛选器中创建一个对象，public override void OnActionExecuting(ActionExecutingContext filterContext){    DetachedCriteria criteria = DetachedCriteria.F...

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